Metal castings have an extremely high upper size limit in casting weight (if none).
Large range of alloy choices.
Tooling costs in the metal casting process are often less expensive than forging dies.
For forgings, custom alloys are more difficult to produce whereas with casting, alloys including nickel, chrome, and moly can be added at the melting stage.
Smaller production runs are not a problem.
Extremely adaptable to mass production needs.
Complex parts and/or thin walled parts are typically not a problem.
Liquid metal can be formed into variety of shapes, allowing greater flexibility in part design.
Modifications of part designs and molds are easier and quicker to implement.
Post-casting results are close to design specifications, reducing time spent on secondary processing/operations.
Cast parts are typically lighter than forgings.
Lead times can be shorter, especially in the case of centrifugal castings.